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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f939dc3e621e87c2ccb3a3d59c835ca2791179b13bcff95c4159458e49f91d3' 
  AND token = 'jYJULtztOWlD+lOM5EPK+VsZYITI9Xn3LO420t80Z+4=' 
  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"
    }
  }
}