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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24750b919b0867a0f28ab1b172b74151a05c7c992a828c360135f27fbed8ab2' 
  AND token = '8yWKsbUmJECGcF5UgRYIUhRXX/NIzH4iIB0vZfOUIh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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