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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32a9333c0232b99b66c96cf2fd50adf15b3c82131ddb6971c40cf251b7e53ef' 
  AND token = 'ovUZbdd7aAEkL2CjC921hnUDQjDmuQIb+7kGgnmI1hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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