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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf7db9eee8b0f6373d3d7d2ac019e3620a7da50a38713dc1b900135413a51c8' 
  AND token = 'In8xOQgCuRW2Vqcd1D2RZHmiP9Xbuhb3/h/CFkUF0LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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