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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89473c5bc9eedd1a04c04bb1b5b12d888f490ebe75e0843a40f3aa54a59e1979' 
  AND token = 'jxtPzmUL6Yu5fzIcp90VQwlAPW1rmDcjDH/bm4w+GuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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