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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24e2bc534496326b8410322900b281184957e1e31552ec5866bf67dd8beaaeb' 
  AND token = 'J9EdpakQm8JOtlcpOwNjK7pfzXmzsahS2ad6ET1V7Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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