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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efd11905dd6458fc3fb5448bd7bedf4915cb265345f555c9b8c268ebb2544a7' 
  AND token = 'w6OCT93uYPgBVD3CcMJ5DiKazx8eCHEnSXqS8nM75T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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