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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b2da9f98beae7a6c3cee97263b6692d43e727f90ca664bea42080145cf78a3' 
  AND token = 'jfVsBUQAbuR9Y8oQM3CX8WRG6002ierZMk+yvnWmFjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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