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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6acad9ed33b558e6ecab4122b7f53e4449528295901412d053e16fa1a881d506' 
  AND token = 'cDTnzFrMBL10d6sDPnlE3703s0aKW+/+2H52n4P1kBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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