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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffc07b3f544960b5b472cc467be5802a15e46a1330884a7844efb46c623f2f2' 
  AND token = 'hs5JatQ5WZ62cophImB9dcdPbA1+/sVH2EI3vNBL6w4=' 
  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"
    }
  }
}