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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8a9740bacc92cd6f1ba0c63af6bfe3b8308ca1a1229a70e233c5bb17ddac3c' 
  AND token = 'qgiVPXtUakYNSy4/uh3pSfoZFLNhNwy75MNGvW4XdA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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