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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f8dbf724cf6a2df9e23cf4cdb5ee8cdc8b8cbfaf29aafca83bfe74fc19562c' 
  AND token = 'BmgwTAUFTj7dPL6q6liLtdBtpgctYP+Uco5DetvhOs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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