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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8106f2f262bbc373c775ac71821abf473ff341eec26d3a7af4967a0cabfbf8' 
  AND token = 'Am6qal3p0ulgilukVAYF9Ss/4IqVdfGkS+A6c/RhnpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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