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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbe30b3fc3440edf169f608b50c2c993bfb6edec6e10bce2a92e2b9ecb21151' 
  AND token = 'i2RKIwckB1cy0oLr4VSJR1bnwux9iJmkzWOeBUYWM04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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