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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ea3c9221184acff1754a1c5150c6d670520fedfb81debaeda8f4850815e383' 
  AND token = 'EhSC4eggMyPCbFq9emifqmPNdrGfPNd+c6pbX+0c1/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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