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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273f8e4e9af7f95257d802118febb6489735dd5a78c22d186a8b88a774af3b4f' 
  AND token = 'KgS9SIoy20eJ/OEvh8ELpnt46hgxIigczhoX5XLfaP8=' 
  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"
    }
  }
}