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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc21261da05cde0f0fc47089620235149e11014c1bb65caf933ae20e72cedb8' 
  AND token = 'GMMHaaTJxGZvN6DVJCczDbrV1OCeJt5I3bR49d8QUuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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