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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34e52ea3a8812ecacad81047ffe5c58b14f5054c0953c7bbff262bb6918fafe' 
  AND token = '/NrazFbh/Mw7osL76DMAHPZ0fHYhWNDBihn52BsqGl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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