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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8855c6ff5e930398dc8cb1c5ac5885d96e20ea15b7745b8064547c1704953c9b' 
  AND token = 'RlTHYy+bW75n4HIqlOqSMiauOLVUyPHeOGQhHPNFlA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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