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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648c1c7b6f45c5de72c3c59790868abe52328e77bff6aeab3106427e9e26d759' 
  AND token = 'aYDH772eZSG5LRbSw1fPg1BBOjH2f3G49fJZWDL/hnE=' 
  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"
    }
  }
}