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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78387997667131287653f47a6a16cc5857cda63c37e2c65617f83d8aedbb009c' 
  AND token = 'zrV3iXPKOVvJQo+Y5zdTSHk8zsklHB8Z8x8/Ct5P8OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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