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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57acdeec21e1f8401ee14433a6e26b72d339a2d5d5e3976dfe7767b16b98cbc2' 
  AND token = 'QdV3j8U4cdw2Vkv02OcBN2iurzj9RFUD9G10iNjVkgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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