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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877cd25c31602be87237fcc9fc1b14666e1e342b17df23174b39d798bf9df783' 
  AND token = 'cDicX1X9lHK75UrX6Qtqbtp17ChL+DvkqpmltbEQXsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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