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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8475674ac0f49f57b0c9b2a4c4d13bdac17ba457e0eeecfe5c7d27fba878a53' 
  AND token = '2CQPH5+iU+Eju08TmuPuyPJF7IIwfJ0Fpg0hlR0nyzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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