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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e26584b193d1c2f751eea06512127b1b1c753ff7a43ef8c063042cad5b9f21' 
  AND token = 'COQwZTLzm5Pjoz5wPCR3eqE6xjEIZ1T1grntfHdTB4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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