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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5d48c396830a02781b5639692589a62d15e2fe02354a5e404b478589a04fa9' 
  AND token = 'Dz7Gt03Yb4gSovjq5kb9lDOdE12OAaL/wLrtR7q5WaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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