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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a9e50e4d56fea1376fc49a2a53e930a13e3775edc7a099100decf3c5108da5' 
  AND token = 'u8OMlluPhHkYKBdtQJ7t2VRUBQqwy2FM2sJqSsZBmik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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