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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9a62d8a9d97060d5f4be4844fe02e0287541154d1f3e578f0bff94b3299ab5' 
  AND token = 'c7wq3N2KzcVWPOHgLRIq1w1eyUgoyaaiDlStrpccx+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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