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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b6ae59078673e1bac4e0eaaa9c2222c23ce7704b385611d9bba52239452a67' 
  AND token = 'EgtYbpthKVn+C/qrpm1tqQDFaUVpRnAwYeOT2AcBY+M=' 
  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"
    }
  }
}