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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883d8871d1c9425a9408bd64f7019011ad6f9c8ed64c2019928580f86fefc441' 
  AND token = 'h44dic9cpMA6nlTFbwibcYsoJ0vm5dT2wx+Ld/au5r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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