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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff40de005d512e4c2939ed6fc02f7a77838f884ddaca1594feaa8f7bd1718cec' 
  AND token = '63dZE4N7AT/KHjY4+yZwNgjzo3+xa4Lv6sDwo3LU2Lg=' 
  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"
    }
  }
}