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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e276dbf85f2f7e85be35b3a807849ad17b9b730d43c764b11f005bcf9177a2' 
  AND token = 'nzjG52Kq8O9cE1Ea08PmdaFPWbwabO1LCfcNmaGMPJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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