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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e48caf67ae99c9b0026c07d3b3f832d627687e3601fa6789b16e8abbbb22d7' 
  AND token = 'IIn+7FrA4jtW0IufwG6u3ZLPUTaPrO82USOUzZYd444=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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