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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b5a7fdbf731dacdcd0542b3e5508291f05910916b0c3b2bf723eb00391bb4f' 
  AND token = '0l0dPThMGM6gh3Dn+LAgIM3oBD06697YgEnqgoOcRaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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