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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff21580101d0c392d7f01551e7692104657ca523961d6bbbb9c33af15a755f76' 
  AND token = 'BFZmBn2U12MTqYvRPu2bTzi4y8tK4xE7UrLtrqc6VJY=' 
  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"
    }
  }
}