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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaa0ab0063ee0f52435e5b6aa36387cb1c152059177b725fe30dd6c1ed0944b' 
  AND token = 'cJyfRP3y6ofgSYOn/hzA4QY1o5i92OzxAe1OxbyLpdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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