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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef03ad09a303b368c28f92bab28ab5d4eba048ec556e1ab58e4c9c11aaf8828e' 
  AND token = '0vgfyKIw0HfB/V3W+EzzPTSbKd0nmLPLPSpo0g8348o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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