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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a04991d898dac89232db72c55d6c6885dc95abe2f43ecd736b0b6eb0c97d709' 
  AND token = 'kq1ytOk5d20WtW4/wWxId/9ZI3yWBmmYQu6qa9MUkAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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