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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3035cbb7f0778147c2020bac1d907a478ad3dfde418e8c95f029ddced7076705' 
  AND token = 'tCAO7KM7VhiD6z0/orTib+aeIAT9LE7vRKZNoWgi8sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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