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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cffa1105f7f16bed5875847b8f62cbfdf1b29880e6d89705a526e53b673802e' 
  AND token = 'gNtfmAtEUzkQXSPB1R3f0Kw9Yrr+EBmk3Il5uT4mqeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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