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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154fd2faa761372241dbd63db744702b726bf0583053d0f4aa3c1cd51dec8a3b' 
  AND token = '6MivJoiiIEcq2FQNMtvuqAlyHUsvditgsMUwsSkeZYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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