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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8e4fb486c7ff6f7146d7633a314e156c5974af1f5dd44720014f043a6a1787' 
  AND token = 'd3Kwuvq9iW1rB907/qIYinGCENVRI71amQQ8HU/O3mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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