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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7a41fa908fd574c9df82dc6ef89bd33119f43f5780d030d57f936f316bfdf5' 
  AND token = 'Av+2fYZtnshebzMW2uh9IhVQfEkuiuR6MoMQXJW/HaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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