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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5979d4ff30865b39347d019f10f798e861b98b3cfc9471550841805b7437a12' 
  AND token = 'GGxPLyy/m5dP+Mu79PLjrtO4wvfPnKpxt3OBdwjZipc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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