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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd5e2eaac7485a9e0b94c54fa27826218a605ca0e9a2e87d39858975af517cb' 
  AND token = 'gsPIFQFbFmXOoqGuRCf7HmzyiX4xjA6mrr9djTtUUtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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