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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8464d7e73aedcddf547f8cad932f22accf0e1ff7dcac72f12230c2e82e8cc8e' 
  AND token = 'jLnMuQC9jW/D6TVZXZkZClyJ2WQH9fZ+lKbR1neLOQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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