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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e11312e1e58ce398796725467098206d09a65e60bf096b445faf9f8bd13f419' 
  AND token = 'j1Rwnz9+RJzzGwcQm1048sbkVJsOM2WWJUxh1xfoc3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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