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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a4a0996f3ea7bdbc9cf8ed5bbdb30588cd305e5fe474bdf9fbb2dbe8e72739' 
  AND token = 'xeOBY5XxV93xuH3oiHTZf7VfMZVNMsq15nPRP1cdN6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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