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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0f8bb167f4466d8d7db0841a972f30b56fa597925495bb7ce31e3066d2ea69' 
  AND token = 'v4SkLtKrICIgClS46LrmAPVDNZfDiZz1+IgKL4Oyj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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