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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0700c38f860061a881e1ff7ec4acca2aaa70d03f1846727396a09c7d550c47ed' 
  AND token = '/eT+Hmmc9u2KQCgWY6290c1/SZc67W954EPTCNB15BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}