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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133fd372a7b4cdbaa71337cf3b49ed5770714364d54cbee0d2adb38d8d6d679e' 
  AND token = 'LOz2YDe6T39/uZLgwYaU2vksCUqFWyEMdtd5Q9x+D8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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