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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55935ca9bdd9a62825c86157645f11c662801b510e77d2db84ff6ed4e687b0f' 
  AND token = 'ehLAAasDTWGSSoYI1OraMff6skpMsXO9K6KnGTv6zvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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