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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862bdbe688765350eba84277c6476f7497fcd63ab779ac73254f258020d51cf4' 
  AND token = 'Fp/8X8Qq5OFlu3TEHsQBoBlC5Z5pv8kYI+/uturle9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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