SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5189cd6cd4915f95e3cd8da37972181b790fd2b89190512afdb94afe2ad7aab' 
  AND token = 'wqAFt0vspBXuVlMfPo7Ru4TYrYZf1TnjG/i8Ws+nsgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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