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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe032e4cb096972252cb4cf5b546bbe2a9ea41a4271019b37183b85e575e6e6e' 
  AND token = '/VRjxG2hfa1v//TGOws6DKowsPxWjaG1K52MBNEpd7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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