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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0bd6da6265c2b971ee81143fd29d2344ec943e557e535fdbbf7f13c8877abf' 
  AND token = '+J3FtB4N8sVQ6Vd3CRGXNxp8EPZls8kApjVibIWcauk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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