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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676ab5613faac906d1d9160ff7be6a049ce54b3a9b9c6ac2f62f294833a070ce' 
  AND token = 'd3GXo2h1eZ8N3DkjwGrSs7h+zSNMb3jRA04XMKHCOU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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