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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71230c6b221bdb6d01e721f13852ba7491bb5b55ce0d33882ff5346fc1014bbe' 
  AND token = '0ydSrpUg0OXIPoQ9yrmLYf3iVIViFQsKEPFYt1gZ4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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