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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0e7361a580bd8beaea2a6b7e9ce0d0d81d4baa7cf4d850bb93e80ea0e07936' 
  AND token = '12QIbwC+j1oGyizDXCViJ4N1SUh1jRljQjfUyMJG5WU=' 
  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"
    }
  }
}