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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be51d0152b80d36814b61abbf03346c008a71f46eb8928d4f66c5a04d5b5a23c' 
  AND token = 'Ft2P2x4miwtBF3eRIVYL7dGPuH9pIXtZEYafMBegAnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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